Numbers 16:37-38

37“Tell Eleazar son of Aaron the priest to remove the firepans from the burning debris, because they are holy, and scatter the fire far away.

38As for the firepans of those who sinned at the cost of their own lives, make them into hammered sheets as plating for the altar, for they presented them before the Lord, and the firepans are holy. They will be a sign to the Israelites.”